Cell Identification • Membrane proteins provide a ‘fingerprint’ for the cell type. • HIV binds to cell receptors that are present on cells inside the body, but not present on skin cells. Called CD receptors (cluster of differentiation). • This is why it is unlikely that you will contract HIV through casual contact.

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---Plasma membrane is the membrane at the boundary of every cell that acts as a selective barrier, thereby regulating the cell’s chemical environment. 1. Membranes are made primarily of lipid 2. Phospholipids are molecules which can form membranes naturally

Fig. 5.3

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